package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.entity.Category;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.mapper.CategoryMapper;
import com.itheima.reggie.service.CategoryService;
import com.itheima.reggie.service.DishService;
import com.itheima.reggie.service.SetmealService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category> implements CategoryService {

    @Autowired
    private DishService dishService;
    @Autowired
    private SetmealService setmealService;



    //删除的菜品是否在套餐里,菜品里是否有菜

    //select * from dish where id = getCategoryId

    @Override
    public void remove(Long id) {    //这个id 是前端输入删除的id
        LambdaQueryWrapper<Dish> dlqw = new LambdaQueryWrapper<>();
        dlqw.eq(Dish::getCategoryId, id);   //要删除的id 存在 dish中
        int count1 = dishService.count(dlqw);
        if (count1>0){
            throw  new CustomException("当前分类下关联了菜品，不能删除");
        }


        LambdaQueryWrapper<Setmeal> slqw = new LambdaQueryWrapper<>();
        slqw.eq(Setmeal::getCategoryId,id);
        int count2 = setmealService.count(slqw);
        if(count2 > 0){
            throw new CustomException("当前分类下关联了套餐，不能删除");//已经关联套餐，抛出一个业务异常
        }

        //正常删除分类
        removeById(id);
    }
}
